Phoslock is the commercial name for a bentonite
clay in which the sodium and/or calcium ions are exchanged for lanthanum.
The addition of this element allows it to bind with phosphates to form
rhabdophane (LaPO4.nH2O) and thereby remove them from the water column. It is
used in lake restoration projects as a tool to manage eutrophication
and manage algal blooms (specifically cyanobacteria
or blue green algae) by reducing phosphorus,
one of the major contributing factors to algal growth.
It was developed in Australia by the CSIRO in the late
1990s by Dr Grant Douglas (US Patent 6350383) as a way of utilising the ability
of lanthanum to bind phosphate in freshwater natural aquatic systems.
More recent CSIRO research has involved the development of a nanoclay hybrid with a demonstrated ability to remove dissolved phosphorus from both natural and wastewaters.
More recent CSIRO research has involved the development of a nanoclay hybrid with a demonstrated ability to remove dissolved phosphorus from both natural and wastewaters.
During its development, patenting and commercialisation by
CSIRO and subsequent commercial production, Phoslock has been a subject in
academic research and has been used
globally in lake restoration projects. The largest number of whole lake
applications and the most comprehensive pre and post-application monitoring has
taken place in Europe, primarily Germany (where it is sold under the tradename
Bentophos), the Netherlands and the UK (Official
European website )
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